Power-hammer.



S. A. THORNBURG.

7 POWER HAMMER.

APPLIOATION FILED MAY 28, 1912.

1,066,063. Patented July 1, 1913.

2 BHEETSrSHEl-ET l.

Inventor Attorneys S. A. THORNBURG. POWER. HAMMER.

APPLICATION FILED MAY 28, 1912.

1,066,063. Patented July 1, 1913.

2 SHEETS-SHEET 2.

Witnesses Inventor Attorneys t] NTTED @TATEd PATENT @FFTCE.

SAMUEL A. THORNBURG, OF FBONTENAC, KANSAS, ASSIGNOR OF ONE-HALF TO ARTHUR J. FLETCHER, OF FRONTENAC, KANSAS.

POWER-HAMMER.

ocaoea.

Specification of Letters Patent.

Patented July 1, 1913.

Application filed May 28, 1912. Serial No. 700,278.

To all whom it may concern:

Be it known that I, SAMUEL A. THORN- BURG, a citizen of the United States, residing at Frontenac, in the county of Crawford and State of Kansas, have invented a new and useful Power-Hammer, of which the following is a specification.

This invention relates to power hammers, and is particularly an improvement in the power hammer disclosed in Patent No. 1,007,159 issued Oct. 21, 1911.

The present invention aims to provide a machine of this character embodying cer tain improvements over the machine disclosed in the said patent so that the ram will be actuated in a novel manner to give a powerful blow and so the ram will recoil after the blow has been struck and will then be raised for a new operation.

The present invent-ion also contemplates the provision of a machine of this character which shall be efficient and convenient in use, which may be readily assembled and taken apart, and which is generally improved in its construction and operation.-

To the foregoing and other ends, this invention resides in the novel construction and combination of parts hereinafter set forth and particularly pointed out in the ap: pended claims, it being understood that this machine is susceptible of alterations or deviations in its details within the scope of the appended claims without departing from the spirit of the invention.

The machine has been illustrated in its preferred embodiment in the accompanying drawings, wherein similar reference characters have been employed to denote corresponding parts, and wherein Figure 1 is a side elevation of the machine. Fig. 2 is a front elevation thereof. Fig. 3 is a fragmental detail. Fig. 4C is a sectional detail taken through the connection between the pitman and the yoke, which are employed in carrying out the invention. Fig. 5 is a transverse section of the column or frame of the machine.

Referring specifically to the drawings, the column or frame of the machine comprises a pair of channel iron members 6 which have their flanges projecting toward each other or disposed inwardly, gusset plates 22' being secured to the flanges of the channel A head iron members 6 at their lower ends.

8 is secured to the upper ends of the members 6 and has a pair of journal boxes or bearings 9 through which a horizontal shaft 10 passes, this shaft having a pulley 11 secured on the rear end thereof and having a crank disk 25 secured on the forward end thereof.

The bracket or arm 12 is secured to the lower end of the column, and a shaft 13 is journaled between the outer end of the bracket or arm 12 and the rear member 6 of the column, this shaft having the pulleys 1A and 15 secured thereon. A belt 2& is trained over the pulleys 11 and 14: and is loose when the machine is not in operation. This belt 24: is tightened by means of an idler 16 carried by the lever 18 pivoted on the column, this lever 18 being mounted on a short shaft 17 journaled to the column directly above the corresponding gusset plate 22. When the lever 18 is swung in the proper direction, the idler 16 may be swung inwardly against the belt in order to tighten the belt which will permit the shaft 10 to be driven from the shaft 13, the shaft 13 being driven by any suitable source of power connected to the pulley 15 by belting or the like.

An anvil 7 is arranged in front of the column, and a U-shaped treadle 20 is pivoted to the column and passes around the anvil 7, this treadle having a cross bar or rod 21 connecting its arms and passing through the slots 23 in the gusset plates 22, which rod 21 is connected to the lever 18 by a connecting rod 19. Thus, an operator or workman in front of the anvil 7 may depress the treadle 20 and swing the idler 16 into position to tighten the belt 24.

A strap 32, which may be lined with fiber or other frictional material, .is passed around the periphery of the crank disk 25 and has its ends arranged below the crank disk and connected to a lever 43 fulcrumed on the column, this lever permitting the strap to be tightened or loosened. An arch 28 passes over the crank disk 25 and the strap 32, the said arch being bent from astrip of metal and having its ends bent angularly, as designated by the numeral 29, and secured to the upper end of the column or to the head 8. A plurality of coiled wire compression springs 30 are disposed between the strap 32 and the arch 28 in order to press the strap against the periphery of the disk 25. The lever 43 is normally swung so as to cause the strap 32 to frictionally engage the disk 25, by means of a coiled wire contractile spring 46 connected to the column and connected to the said lever by means of a connecting rod 45. A connecting rod 44 also connects the lever 43 and the treadle 20, so that when the treadle is depressed to swing the idler 16 into position to tighten the belt, the strap 32 will be simultaneously released from the disk 25 in order to permit the shaft 10 to rotate. The strap 32 serves as a brake to stop the rotation of the shaft 10 and the mechanism connected therewith as soon as the treadle 20 is released, the idler 16 also being swung out of engagement sufliciently to loosen the belt. It will therefore be seen, that when the treadle 20 is depressed, the shaft 10 will be released by the braking mechanism and will be brought into operative connection with the shaft 13 so that the crank disk 25 is retated in order to actuate the ram hereinafter referred to, and that when the treadle is released, the said shaft will be simulta neously engaged by the strap 32 and disengaged from the shaft 13 so that the rotation of the shaft 10 will be stopped as soon as the treadle 20 is released. The spring 46 which is connected to the lever 43 not only serves to tighten the strap 32 against the disk 25 but also serves to normally raise the treadle 20, thereby also freeing the idler 16.

A pair of guides 52 are carried by the column, these guides abutting against the bosses 54 secured to the column and screws 56 being passed through a transverse slot 55 in the guides 52 and engaging the bosses 54. It will therefore follow, that by loosening the screws 56, the guides 52 may be adjusted laterally to take up the wear or to accommodate the ram 50, the said ram having a slide 53 at its rear side engaging between the guides 52. The ram 50 is therefor-e mounted for reciprocation between the guides 52, or the slide-way provided thereby, and the said ram and anvil 7 are provided with suitable cotiperating dies 51.

The disk 25 is provided with a crank pin 26, which crank pin has a bearing mounted thereon comprising the sections 27, and a pitman or connecting rod 33 is connected to the said bearing, the said pitman having its upper end forked to provide two arms 31 which pass through the sections 27 and bear the nuts 60 for adjusting the pitman relative to the bearing and for clamping the sections 27 of the bearings together against the crank pin 26. To the lower end of the pitman 33 is secured a disk or plate 34 having depending ears 35 and a bolt or other similar member 36 is passed through the said ears.

A pair of angular or elbow levers 47 are pivoted at their inner ends on the bolt 86 between the bars 37 and have their free ends depending at the respective sides of the ram 50, the lower ends of the levers 47 being connected to the sides of the ram 50 by means of the links 49. Sections 37 are secured to the upper arms of the levers 47 and are pivoted to the bolt 36. A yoke 38 is slidable on the pitman 33, the said yoke being U-shaped with the intermediate portion slidable on the pitman, and having the ends thereof bent outwardly to form ear-s 39, a coiled wire compression spring of considerable tension being disposed on the pitman 33 between the yoke 38 and the plate or spring seat 34 the lower end of the said spring bearing against the plate 34. An eye bolt 41 is connected to each lever 47 adjacent the bolt 36 by means of a bolt or other member 42 passed through the eye and connected to the lever, the tail of the bolt passing through the corresponding car 39 of the yoke and having a nut 48 screw-threaded thereon above the said ear.

In the operation of the machine, the shaft 7 13 is connected to a suitable source of power by means of the pulley 15, and is rotated so that when the treadle 20 is depressed,- the shaft 10 may be made to revolve. The shaft 10 in revolving will carry the crank pin 26 therewith so that the plate 34 is reciprocated. Presuming that the crank pin 26 is in its uppermost position and that the ram 50 is raised therewith, when the crank pin 26 moves downwardly, carrying the bolt 36 downwardly therewith, the inertia of the ram 50 will momentarily retain the ram in its elevated or raised position so that the bolt 36 in carrying the levers 47 downward will cause the outer ends of the links 49 to be swung downwardly below the horizontal line of the in-nerends of the links so that the links converge upwardly. The outer ends of the links 49 being depressed below the ram 50 will cause the lower ends of the levers 47 to be swung inwardly thereby carrying the yoke 38 downwardly on the pitman 33 and bringing the spring 40 under greater compression. As soon as this takes place, the ram 50 will have lost its inertia and will be given a rapid downward movement of considerable momentum, the movement of the ram being impelled by gravity and by the tension of the spring 40, so as to create a powerful blow against the object held between the dies 51, or so that the upper die 51 will impinge with great force upon the object held on the lower die 51 and the links 49 swinging beyond a straight line position to converge downwardly. The crank-pin 26 in moving upward will raise the parts connecting the said crank pin and the ram, as well as the ram, permitting the operation to be'repeated each time as the disk 25 revolves. The ram 50 in striking the object will be recoiled or will rebound therefrom due to the tension of the spring 40, which tends to swing the lower ends of the levers 4E7 apart and thereby raise the ram. It will be seen that when the inner ends of the links are disposed upwardly relative to the lower ends of the levers 47, the spring will be compressed, and also, when the inner ends of the links are arranged below the line connecting the lower ends of the levers, the spring will be compressed, so that when the plate 34 is first moved downward and the ram remains in uppermost position, the spring will be brought under tension so as to assist the ram in its downward movement by reason of gravity, and after the links have passed the straight line position, the spring will again come under tension so as to cushion the ram and cause the same to rebound from the object which it has impinged upon. From the foregoing, it will be understood that the operator or workman may place the object to be hammered on the anvil and then by depressing the treadle may cause the ram to impinge upon the object with repeated blows as long as the treadle is depressed, and thus by releasing the treadle, the movement of the ram may be halted or arrested.

It will be seen thatthe general operation of the present machine is similar to the operation of the machine disclosed in the aforementioned patent, but the machine as constructed in accordance with the present invention possesses a number of manifest advantages.

The present machine is eflicient and convenient in use, it may be readily set up or taken apart, and is desirable in a number of respects, which it is not necessary to itemize.

Having thus described the invention, what is claimed as new is 1. A power hammer embodying a reciprocatory member, a spring-pressed yoke slidable thereon, a reciprocatory ram, levers fulcrumed to the reciprocatory member, members operatively connecting the yoke and the respective levers adjacent their fulcrums, and links connecting the levers and ram.

2. A power hammer embodying a rotary member, a pitman connected thereto, a reciprocatory ram disposed below the pitman, a spring seat secured to the pitman, a U-shaped yoke slidable on the pitman, a spring between the yoke and spring seat, angular levers fulcrumed to the spring seat and depending at the sides of the ram, connections between the ends of the yoke and the levers, and links connecting the levers and ram.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

SAMUEL A. THORNBURG.

Witnesses:

JOHN HADERLEIN, I. E. BAILEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

